The critically-acclaimed board game
MooT
consists of tough questions about the nuances of the English language.
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Answer:
tip of the iceberg

The tip of the iceberg is the part of the
iceberg (about 1/9th) that projects above the surface of the water. The phrase
implies that the real magnitude of the problem isn't apparent.

Thanks to all the people who played. The winner is:

James Wood --- @worldnet.att.net

who will receive a free MooT game in the mail.

This was fun, so I'll do it again in November. In the meantime, back
to regular MooT questions.